Art of vaporizing fuel



April 5;` 1927.

Q F. LARZELERE ET AL ARTOF VAPORIZING FUEL Filed April l5, 1922 2 Shee1zs-Shee*v l Jia,

@fk5 EL gnawwtoz April 5, 1927.

C. F. LARZELERE ET AL Filed April l5, 1922 Patented Apr. 5, 1927.

orifice;

CHARLES-F. LARZELERE AND CHARLES H. Niinivinynn, 'or' FLINT, MICHIGAN.

ART or VAPOR'IZ'INGFE'L.

Appiicaiion inea April i5, i922.

` rlhis invention relates to the art of vaporizingy fuel, pertaining more particularly to apparatus adaptedfor use in vaporizing ibusti'on engine-thus having characteristics of'a priming charge-or the charge may be a supplemental or auxiliary charge adapted to augment the usual charge under abnormal conditions encountered in the operation of th'e engine. i

As is Well known, more or less `difficulty is had' in startingan engine of this type'in-v stalled, for instance, on a motor vehicle,when the engine is cold; at suoli time the parts ofthe engine are' unheated, and it becomes more erless difliicultfto set up conditions of proper vaporizing ofthe fuel necessary to provide for engine operation; the fuel is in liquid form, and While there isthe presence of suction', and air is admitted, the fuel is notlgive'n the atomization or vaporization suchas is provid'edivhen the engine' has been operated and has warmed up This difficulty is especially manifested during the colder months of the year when the aii is itself'at low temperature. And in this is Vfound one of the reasons ivhy it beconies necessary tot' employ' excessiveI cranking of the engine-Where starting is by the use of a craukor an excessive oper`-` ation of the'starting inotor-ivlien th'e starting is by the use of a power device.

The present invention is designed to meet conditions of this kind, the purpose being Ato produce a vapori/ed charge of a gein erally suiiicientan'iount for the purpose, withV rapidity, so that initial charges delivered tothe intake manifold ofthe 'engine'liave the characteristics of the charges developed when the engine is innormal running con-` `includes a retort formation into which fuel Serial'4 N: 553,281.

is delivered at will and in ywhich the de,-` livered fuell is'subjected to the act-ion of `heat such as will lrapidly vaporize such fuel content. The invention preferably delivers a predetermined amount of fuel to theretort, thus permitting practical assurance ofthe-i development of the proper amount and character of vapor in a practically definite time period, thusmakingit possible to` produce practically the `same amountof vapor vWithin 'the Asame time -period'whenever the apparatus is placedin use; and t-hisresult is better assured by 'the use 4of a heating formation in theiform-'of an electricalheatingncoil, since the time required toi bring the heating element to its operating tem'-`l peratures is short and more or less uniform in successive use.

@ther features are present, as presently described, as, for instance,the generalformation of the apparatus Which eiiablesthe` reservoir to be vreadily filled, fthe substantially concurrent delivery of fuel and closing of the circuit tothe heater,'the simple and eiiicien'tconstruetion, theease ofinstaL lation, and therelatively low costofinair' ufacture.

To these and other ends, therefore,' the nature of which Will be readily understood as 4the invention is hereinafter disclosed, said. invention consists in the improved cn struction and combination of parts herein# after more fully described, Aillustrated in the accoinlianying idrawings, and more particuarly pointed out Vin the appendedclaims.

InY the accompanying drawings, vin Whichsimilar reference Icharacters indicate similar parts in each of the vievvs,-

Figure 1 is a side elevation of a portion of an internal combustion' ei'igineofa `Well known type with the present invention@ located in a position of use thereon."

`Fig; 2 is a central longitudinal sectional view of 'the apparatus of our invention, parts being shown `in elevation.

Fig. 3 is a vieiv'in elevation of the struc-' ture shown' in Fig. 2.

Figs. 4i and 5 are `detail.sectional views showing" different 'positions of the fuel'eharge segregating structure.

Fig. 6 is a sectional view ltaken o'nithe line 6 6 of Fig. 2.

Fig. 7 is a' sectional view taken on line 7-7 of Fig. 3. i

Fig".` 8 is la viewshoiving la portion of the structure ofi Fig. 2 but applied to the engine in a different way from that shown in Figs. 2 and 3.

F ig. 9 is a view in elevation ot the device located on the engine at a different point from that shown in Fig. 1, the view omitting some ot the parts shown in F ig. 1.

Fig. 1() is a detail elevation, and

Fig. 11 is a transverse section ot a portion ol' amodified n'lounting tor the device, only a portion of the latter being;` shown.

For the purpose of' illust ating the invention we have shown it as applied to an internal combustion engine such as is employed in the well known Ford car, the upper portion ol the engine being shown in Fig'. 1, in which firl indicates the intake manifold, the carbureter being indicated at c and having the usual air intake pipe c. In Fig. 9, which represents a different installed position ot our invention, we have shown simply the carbureter c and a. portion of the manifold a, it being` understood that a suitable air inta-ke will be provided leading to the carbureter.

The invention is shown generally in Figs. 2 and 3, these figures indicating the invention as located in the position ot Fig. 1, with the structure mounted upon the air intake c The structure generally is in the Jform of a casing 15 made up of a retort portion 16, a reservoir portion 17 and a charge-segregating portion 18, the latter being located between the retort and reservoir portions.

As shown in this particular form of the invention, the retort iS of the open-bottom type, the retort being ot suitable configuration in cross section-shown as circularwith the lower open portion ot the casing having a configuration such will readily seat on the air intake c', a suitable gasket l being: interposed between the pipe and the casing, the casing beingr removably secured in position by suitable means, such, `for instance, as a member 15l removably held in position by screw 15. 'I he air intake is in open communication with the retort through an opening,` c2, this opening' extending; through the wall opl the air intake as well as ,gasket el.

The retort is of a suitable vertical height and is designed to carry a` vaporizing element of suitable character but which is preierably of the type shown in the drawings. This element preferably comprises a core 19 of suitable dimensions and ot suitable material-asbestos 'for instance-and a heating' coil 20, the latter being; preferably formed as shown in the drawings in which one end, 20, is secured to casing 15 by suitable means, as for instance, a screw, then passing axially through the core and laterally to the periphery of the core where it is coiled about the core, the opposite end portion 20" then being;` lcd out-ward tl'irough an opening lo ol the casing' portion which forms the wall olt the retort such end then passing` to a hindii'xg-post 2l carried by a suitable insulating` block 22. The coil is ol.' the high resistance type, such tor instance as is termed Afrom Nichrome wire.

Since end 20 is located at the lop ol the core, it will be readily understood that the hcatinp` unit thus produced is practically suspended troni such end olE the coil, the core extenifling; downwardly, preferably in the axis ot the retort and above and spaced. 'troni the (')penilln' nl. As shown, the overall diametrieal dimensions4 nl' the core are nialerially less than the diameter ot' the retort, and since the upper end ot the heating unit is also spaced Yfrom the top wall ol the re tort, it will be seen that the heating unit practically `forms a central 'fuel receiving, structure ol dimensions such as are materially smalle-r than those ot' the retort itself. thus providing; a tree space ol comparatively large dimensions within the retort for the free movement of the vapors gen erated when the coil is active, presently described.

Reservoir 17 forms the upper portion of the casing and is of considerable dimension in order that a considerable quantity of fuel may be located therein. The upper end of the casing is shown as formed with an opening; 17a adapted to be normally closed by a cover 23, opening 17a being?r designed for use as a reservoir lillincj opening', cover 23 forming a closure for the reservoir. A. simple means is shown 'tor the purpose ot retaining the cover normally closed, this means being shown as a coil spring' 23 having one end secured to cover the opposite end being' secured to a. loop 24 ot a member 24e having; the general cen'liguration shown in Fig. 2, one end being designed to contact a shoulder at the top ol. the reservoir, the other end being held in contact with a vertical wall el' the reservoir throuajl. the pull of spring Q3". The structure provides an arrangement which will retain the cover seated and yet permit it to be raised bodily or canted to permit introduction ol a spout ot a suitable filling); can whenever desired. Obviously. itI it is desired to remove the cover, it is only necessary to raise the cover su'fiiciently to permit access to the interior o'l the reservoir and then shi'l't the upper end el member to bring it to opening` 19n whereupon the entire structure may be removed.

The reservoir 17 and retort 1G are shown as spaced apart by a web 25 ol considerable thickness, this web Q5 being shown as provided with a tapered recess 25"L which has its axis extending transverse and intersecting' the axis ot the casing, the recess extending rom the front :tace of the casing` y closedat the pluOf-Iend whenthe' toa depth `sutlic'ient'to extendfadjacent the rear' face of the casing,I thus Icarrying the recess some-distanoebeyond theaXis of the casing. `This recess is adaptedl to receive -a plug 26 of complement-al*peripheral-contour-to the recess, 'the tapered portion of thev plug beingfprelerably of less length than the-depth 'of the recess; the plug has someV of'the characteristics ofthe `usual `turning plug, being l'designed "tof 'control the passage of fuel frbm rese'rvoir'l7 lto retort 16, portion125 beingiprovide'd l'with openings 253 and 25` these being arranged, in the-speciiic embodimentfshown, `in axialalinement. However, plug '26' `isdesigned to serve an additionallpurpose,` viz: that of controlling the amount of Vfuel fthat'y can be'transi'erred from thel reservoir to the retort at any single operation of the plug. This resultis obtained by arranging the ports of the/plug i as'isliown more particularly in Figs. 4 and 5, port 26a, which co-operates with opening 25b beingl out ot axial alinenient with port 26" wliich co-operates withvport 25W-both port-S26@ and 26?, however, extending radi# ally troni a longitudinal port 26, the latter port being openf'to the bottom ot recess 25a, althoughthis latteris not absolutely essential.

As will be seen in Fig. 4:, in which the plug is atfone extreme of its movement, openings- 25b and 26a are in alinement, `while port 2.6b ind opening 25'c are out of communication in this position fuel can pass fromthe reservoir" "into the space provided byopenings 25h, 26, 266,"the space at'the bottom of recess 251'and poit 261?, this space being Villed and remain-v ing filled while lt-he plug is in this position.`

It', however, the plug be shifted so as to bring port 2Gb into registrationy with opening 25, as in Fig. 5-the opposite extreme of moveinento'l! the plug 26--conimunication Iwith the 'reservoir 17 will be shut ott' Iand this content# referred towiththe exception of' that within opening l-'- is free to flow into the `retort 16 through opening 25, excepting possibly that portion-in yrecess 25@ below opening 26. To permit thisr content to readily and quicklypass into the retort, we preferably provide anair-inlet port 25d which, when the plug is in the position of Fig. 5, registers with port 26a`,butwhich is parts are in the position of lig. 4.

As opening 25 is preferably arranged in approximate alinenient with the aiei'si'of the heating'unit, itw-ill'be readily understood that'the content o'l' definite amount of fuel thusdiseharged through opening 25- passes directly Aontotl`ie core 19 'of the heating unit. -And asthelatter is of such material as will permi-t the uelto readilyaperineate the core, it will be obvious thaty this definite charge of ifuel'will bef quickly distributed witliiirthecorei and. thus be in a `favorable position andcondition to be rapidly vaporized upon application of heat to the vcore,

this latter being the-function of the heating coil vwhich is adapted to be connected upto a suitable source of current'supply aspresently described. .By reason ol' thel fact that the heating unit remains unchangedV as t0 dimensions,- has a practicallydefinite time period iirwhich to reach its active temperature value, and the charge is of deniteA amount of fuel, it will be readily understood that the-tiine-lengtli `:tor vaporizing this charge can be predetermined because offthe possibilit-y of control of thefdimensions and characteristics of the heatingunit, the current supply, and-the ainountot `fuel within the charge, thus insuring that vapoiizing of successive charges willk be of siniilar'characteristic and making'rpossible tliefcompletion of the vaporizationA with rapidity. Hence,`it is possible to bring the-engine into running condition wit-hout extensive cranking, either by hand or by starter' structure;

In addition toI segregating ,and delivering the charge, plug 26 has the additional iuncJA tiono makingand breaking thet circuit insuch manner that) fingersL 29 and 3() are permanently out-'of contact-although they are` arranged to have -theirf`free ends side by side--theineniberv or. finger 28 being designed to bridge the gap between t-lie free ends of fingers 29 and 30,J thus breaking theicircuit through the heating coil; F 3 shows the position of the-turning plug when the latter is in the position shown in Figl.

The turningplug` is normally held in this position to break the circuit-the position of Fig. fl-by means of a spring which connects a handle 34 carried by the plug and a suitable member carried by one of the screws 15b. InA this position, the-.turning plug is in communication with the reservoir f 17 and thusreceives and contains the charge to be vaporized, the structure being inactive `at this time, the circuit through theheaung coil beingx broken in the gap between `fingers 29 and 30. If, however the handle'or lever .34 be rocked upwardly in F 3,the` plug' 26 will beshifted to bring itsports into the position of Fig. 5, and at the saine time close the circuit at the make and breakpoint providedv by fingers 29 and 30, with the result that concurrently lwith the droppingo the"- lit) charge on to core 19, the circuit will. be conipleted through coil which is quickly brought to active temperature to set up the vaporizin g action.

rl`his movement of the lever 34 is provided by a suitable operating member 86 which has one end connected to the lever, the member being carried toapoint where it can be readily manipulated to set up this movement of the lever; for instance, member 3G may extend to the instrument board of the motor vehicle, or it may extend to a point adjacent to the hand c'ank. Obviously, spring 38 will rcturn the lever to the position in Fig. C-l whenever member 36 is released, To limit the throw of lever 3l, we preferably yemploy a pair of stops 3T, located at proper points.

The plug may be held in position in any suitable manner; the simple arrangement shown in the drawings has a spring element 38 carried by the casingand which has its free end active on the outer end. of the plug, the member thus tending to retain the plug in it-s seat and at the saine time automatically take up any slight wear that might be had as well as permit relief should there be any tendency of the plug to stick.

It will be understood, of course, that the device is designed to be rendered active at the time of starting, the operator manipulating member 36 about the time he begins the cranking operation, so that the suction action set up will become effective in withdrawing the vapor from the retort through the operative connection of the fuel intake a and openings c2, air :inlet port d acting as a ventvvhich will permit of the rapid drawing of the content from the retort into the connections leading to the intake a. As a general rule, the amount of fuel in the charge will be sufficient when vaporized, to supply the requisite amount of gas to effect efiicient starting action, and this vapor will be provided in a comparatively shorttime so that the operator need not retain the member 36 in its vapor producing position for any extended length of time; in fact, any attempt to extend this length of time acts simply to use up electricity in the heating coil, and thus become a waste. Since release of member 36 returns the plug to the position of Fig. 4 and thus provides a new charge, any necessity for using a second charge of gas can be readily had by simply repeating the operation.

And it will be understood, of course, that the apparatus may also be rendered active in the same way during running of the engine as, for instance when abnormal conditions arise which require a larger charge than that supplied ordinarily for a short period, the vapor from the retort being added to that supplied through the carbureter to augment the charge at such time.

The device may be employed on either lside of the carburetor, Fig. l illustrating the device as positioned in advance of the carl'iureter, so that the vapor charge produced, is delivered to the intake through the carbureter, the heated condition of this charge aidingr in the carburetting action. Or, shown in Fig. 9, the device may be located in rear of the carbureter-between it and the fuel intake. In either case, the vapor content reaches the fuel intake of the engine and becomes a part of the engine operating charge.

As shown in Fig. F5, the device need not be mounted directly upon or above the air intake c', but may be secured to a separate element 4t() through which the vapor content of the rei ort may pass into the line leading to the fuel intake n..

And in Figs. 10 and il, is shown still another modified arrangement of the support,fthe air intake being connected up to a member il which acts to support the device, this member taking on thc form of a compartment opening into the retort and into the air intake. This particular form may be fabricated at the manufactury of the device, the air intake being a pipe which is connected up to casing l5 by screws 42. the air intake c2 of this form being arranged to permit its ready positioning with respect to the carbureter or to the fuel intake or both, depending upon the place Where it is desired to install the device.

In the particular embodiment shown, we have employed an electric circuit in which one side is grounded at the screw 20. 1t will be understood, however, that the grounded portion of the circuit may be replaced by a direct lead to the battery or other source of current supply.

And while we have shown the reservoir and retort as an integral structure, it will be readily understood that the portion of the instrumentality shown as unitary, may he an assembly or fabricated formation, the various elements beingconnected together in any suitable and obvious manner.

As Will be understood, the structure is simple and efficient in operation. durable in construction and can be manufactured at a relatively low cost.

Claims to the specific heating unit are presented in a divisional application filed September 10, 1923, Serial No. 661.774.

While we have herein shown and described various embodiments of the invention, it will be readily understood that changes or modifications therein may be found desirable or essential in meeting the various exigencies of use` and we desire to be understood as reserving the right to make any and all such changes and modifications as may be desirable or essential, in so far as the same may fall Within the spirit and 1 reservoir insuperposed.relation and spaced apart, ah eatvapor1z1ng. unit .operative `scope .ottheinvention and .as expressed in the accompanyingl claims when broadly construed.

Having thus. described our invention,

what we claim .as new is:

A LA vaporizing instrumentality Yfor in-` ternal combustion engines comprising a casing luiving a retort portion ,and a .fuel

reservoir `in superposed relation and spaced` apart, a heat-vaporizmg unit operative -Wjithin the retort,`and means interposed between :the ,retort and .reservoir `for trans 'ferring'fuel from said reservoir to the. unitl in the retort at \vill,fsi:id vmeans including a n1ovable member operative to segregate ,aicliargejrom the reservoir .and deliverv it;

to the unit.

.2. A vap'orizmg.instrumentality for mternal combustion engines comprising a casing having afretort. portion .and a fuel within theretort, and means interposed` between the retort fand reservoir tor transterringifuelffrom said reservoir. tothe unlt in V.the `retortat.willsaid means including a movable Imember having i substantially. ,non-

concurrent communication with both reser,

voir and, retort, said .member .being Lmovable between two extremes of .movement, the

y movement from one extreme .to `the other. in

,1 tween; the retort and reservoir for 1 transferring uelfrom .said reservoir. to theunit in the retort at will, .said means including a.; movable Vmember having substantially noli-concurrentV .,eommunication.v with 1both 1 reservoir .and retort, said member being movablefbetween `two extremes of movement, thejimovement ffrom one extreme. to the other in.one direction being operative to, segregate acharge from the reservoir'and deliver it to the unitVthe movement in the opposite direction placing the member in position to receive the fuel for thasucceedcharge.

`LA vaporizing instrumentality for internal combustion engines` comprising. a. casing having a retort portionandy a fuel reservoirvin superposed relation and spaced apart,1, a heat-vaporizing unit. operative witliintheretort, and. means interposed between they reto-rt and reservoir for transferring fuel from said reservoir Ltol/the unit in thelretort at w-il1,said means including an element -movably rotatively between `two positions, said element having a pair of communicating ports, said Iports lbeing adapted to communicate with the reservoir andy retort respectively andl positioned to prevent communication between .reservoir and retort when theelement is in either of its extremes otmovement.

5. A vaporizing instrumentality forrinternal combustion,engines `comprising, a casing having a retortportion and. a.` fuel reservoir ,in superposed relation vandjspaced apart, within; the retort, and .means interposed ,between 4the .retort and reservoir..for. trans terringftuel from said reservoii-to thennit in-theretort` at. will, said means. including an 4element movably rotatively between two positions, said element having apairof communicating ports, said'..po1ts being adapted to communicate with the .reservoir andretort respectivelyVsaid ports extending radially .andhaving their-.outer -ends relatively positioned to maintain closure. of one of such ends Iwhenthe. otherend is in complete lopen position.

6. An. instrumentality as in claim lcharacterized in that the member is intheiorm of, a tapered. .turning .plug Acarriedjby theV casing Land having a limited. movement. rota.-V tively, said plug having a pair of..co1n municating ports which. communicate .respectively,.\vith the. reservoir and. yretort through. casing openings, the.-ports and openings. being. relatively `positioned to...p1event fuel.,passage `from.foneopening to the' other Lthrough tlieports whenthe 1plugis in either eXtreme of its movement.

i 7..An.instrumenta1ity as in claim 1` characterized in .that said means .also .includes an ,air vent active throughthemember during the uelftransferrin'g activity.

. 8. An instrumentality as in iclaim Zchar acterizedjn that the means alsoincludes an` Vair vent activethrough the .ports when the member is in thechargesegregating and delivering position.

9.. An instrumentality asinclaim 2 characterized vin that the means va.lso includes an airvent adaptedto communicatewith said` ports by movement of the membento its charge fsegregating v,and deliveringr posi! tionl and be maintained active [while the member. is in such position.l

a heat-vaporizing ,unit operative 10. A vaporizing. instrumentality for internal combustion engines con'iprisingL4 a casing-having. a retortportion and afuel reservoir in superposed relation and spaced apart, a. .heat-vaporizing unit operative within the retort, `and means interposed between the retort and reservoir fortransferring '.luel from saidvreservoir toithe :unit in the retort at will, said means` .including a movable member operativelto .segregatea chargetrom the reservoir,landdeliver. it to the unit, saidheating` unitincluding,an electrically-operated heating coil and a fuel- CIK charge receiving formation supported by the coil.

11. An instrumentality as in claim 1() characterized in that the coil receiving formation arel of less dimensions than the internal dimensions of the retort.

12. An instrumentality as in claim 1() characterized in that the receiving formation comprises a plug having the characteristic of supporting and diffusing the delivered charge.

13. An instrumentality as in claim 10 characterized in that the receiving formation comprises a plug of fibrous material.

14. An instrumentality as in claim 10 characterized in that the receiving formation comprises a plug of asbestos.

15. An instrumentality as in claim 1() characterized in that the circuit for the heating coil includes a make and break switch positioned to be rendered active to close the circuit when the member is in charge segregating and delivering position.

16. An instrumentality as in claim 10 charaacterized in that the heating coil circuit includes a make and break switch having a movable element operated by the means member for controlling Vthe circuit activity.

17. An instrumentality as in claim 2 characterized in that the member is normally maintained in its charge receiving position by a spring, means being provided for moving the member to its charge segregating position in opposition to the spring.

18. In the art of vaporizing fuel for internal combustion engines, a fuel vaporizing instrumentality adapted to be positioned relative to the flow line leading to the intake manifold of the engine, said instru mentality including a casing having a vaporizing retort positioned above and permanently open to such flow line, a vaporizing unit Within the retort adapted to be rendered active at Will, a fuel reservoir in superposed relation to the retort and spaced therefrom, means interposed between the reservoir and retort for transferring in bulk a charge of fuel of predetermined and definite amount from the reservoir to the retort at will, the point at Which the bulk charge is received by the retort corresponding to the point of vaporizing activity upon the charge, and control means common to said vaporizing unit and said transfer means for producing charge delivery in substantial concurrence with the beginning of unit activity.

19. An instrumentality as in claim 1S characterized in that the instrumentality elements are operatively related to cause the charge toV be segregated from the content in the reservoir in approximate concurrence with the beginning of the vaporizing period.

20. ln the art of vaporizing fuel for internal combustion engines, a fuel vaporizing instrumentality adapted to be positioned relative to the flow line leading to the inw take manifold of the engine, said instrumentality including a casing having a retort positioned above and permanently open to the flow line, a fuel reservoir in superposed relation thereto and spaced therefrom, said retort having a heating unit adapted to receive and vaporize a charge of fuel delivered to it in bulk, means interposed between the reservoir and retort for transferring in bulk a charge of fuel of predetermined and definite amount from the reservoir' to the heating unit at will, the point at Which the bulk charge is received by the retort corresponding to the point of vaporizing activity upon the charge, and control means common to the heating unit and said transferring means for producing charge delivery in substantial concurrence with the beginning of unit activity.

21.1111 instrumentality as in claiml 20 characterized in that the heating unit is rendered active at will by the control means and that the transfer means activity and inactivity is by movements in a rotative direction, the control means being operative to provide such rotative movements by the operation Which renders the heating unit active and inactive.

2Q. An instrumentality as in claim 20 characterized in that the transfer means is in open communication with the reservoir during periods of means inactivity and is movable rotatively to produce transfer activity and concurrent charge segregation.

23. An instrumentality as in claim 20 characterized in that the heating unit is positioned out of the direct now-path to the manifold and is of materially less dimensions than the internal dimensions of the retort and is positioned in generally spacedapart relation to the retort Walls.

24. An instrumentality as in claim 2O characterized in that the vaporizing agency of the heating unit is an electric circuit containing a resistance coil, the control means being operative to control the making and breaking of such circuit.

'25. An instrumentality as in claim 18 characterized in that the transfer means includes an air vent rendered active during the fuel-transferring period.

26. An instrumentality as in claim 18 characterized in that said transfer means includes an air vent rendered active during fuel-transferring` activity and rendered inactive when such means is receiving the succeeding charge.

9.7. An instrumentality as in claim 18 characterized in that delivery of the charge from the transfer means is aided by an ail? vent rendered active by the control means activity in segregating the Charge.

28. An instrumentality as in claim 20 characterized in that the vapoiizing agency of the heating unit is an electric circuit containing a resistance coil with the circuit including a,r circuit make Vand break device, the transfer means being operatively eonnected to said device through the control 10 means in such manner that theV movements of the transfer means between its limits of movement aetuates the device to control the making and breaking of such circuit.

In testimony whereof We aiiix oui` eigna- 15 tures.

CHARLES F, LARZELERE. CHARLES! H. NEUMEYER. 

